Post Office - Greenville 9615 Highway 150 Greenville, IN 47124 Phone : (812) 923-8034 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--u S Postal Service, Greenville Post Ofc 9615 Highway 150 Greenville, IN 47124 Phone : (812) 923-8034 United States Government--u S Postal Service, Greenville Post Ofc Business Category Government Offices-Federal Government Offices & Public Schools